On February 23, 2018, Ube Industries issued a public statement regarding improprieties in quality checks for low-density polyethylene manufactured at the Chiba Petrochemical Factory. As detailed in the statement, Ube Industries assembled an investigation committee comprising attorneys without conflicts of interest and external directors on February 21, 2018, in order to neutrally investigate the causes of the incident and confirm the validity of preventative measures formulated by its emergency office.

On March 30, 2018, Ube Industries issued a statement that the investigation committee expected to conclude its investigation by around the end of April 2018. However, the investigation committee has recently informed Ube Industries that it requires additional time due to the scope of the investigation being expanded to encompass the UBE Group to conduct a high level investigation to get trust and consent of all stakeholders of Ube Industries. As a result, the committee expects to conclude its investigation and issue a final report in early June 2018.